Arthropod appendages are specialized for diverse roles including feeding, walking, and mating. Fossils from the Cambrian period (539 to 487 million years...
Horseshoe crabs are an ancient lineage with an evolutionary history stretching back 450 million years (Ordovician period) and are generally considered...
Horseshoe crabs, or xiphosurans, are an order of marine and brackish water arthropods. Despite their common name, they are not really crabs, and are more...
